fs/freevxfs/: add #include's

Every file should #include the headers containing the prototypes for
it's global functions.
Signed-off-by: Adrian Bunk <bunk@stusta.de>

fs/freevxfs/vxfs_bmap.c

@@ -36,6 +36,7 @@
 
 #include "vxfs.h"
 #include "vxfs_inode.h"
+#include "vxfs_extern.h"
 
 
 #ifdef DIAGNOSTIC

fs/freevxfs/vxfs_olt.c

@@ -36,6 +36,7 @@
 
 #include "vxfs.h"
 #include "vxfs_olt.h"
+#include "vxfs_extern.h"
 
 
 static inline void